Relocate DiskSpace metrics to SystemMetricsAutoConfiguration

Closes gh-27688

Author: snicoll

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/JvmMetricsAutoConfiguration.java

@@ -16,11 +16,8 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
-import java.io.File;
-
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.binder.jvm.ClassLoaderMetrics;
-import io.micrometer.core.instrument.binder.jvm.DiskSpaceMetrics;
 import io.micrometer.core.instrument.binder.jvm.JvmGcMetrics;
 import io.micrometer.core.instrument.binder.jvm.JvmMemoryMetrics;
 import io.micrometer.core.instrument.binder.jvm.JvmThreadMetrics;
@@ -69,10 +66,4 @@ public ClassLoaderMetrics classLoaderMetrics() {
 		return new ClassLoaderMetrics();
 	}
 
-	@Bean
-	@ConditionalOnMissingBean
-	public DiskSpaceMetrics diskSpaceMetrics() {
-		return new DiskSpaceMetrics(new File("."));
-	}
-
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/SystemMetricsAutoConfiguration.java

@@ -16,7 +16,10 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
+import java.io.File;
+
 import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.binder.jvm.DiskSpaceMetrics;
 import io.micrometer.core.instrument.binder.system.FileDescriptorMetrics;
 import io.micrometer.core.instrument.binder.system.ProcessorMetrics;
 import io.micrometer.core.instrument.binder.system.UptimeMetrics;
@@ -59,4 +62,10 @@ public FileDescriptorMetrics fileDescriptorMetrics() {
 		return new FileDescriptorMetrics();
 	}
 
+	@Bean
+	@ConditionalOnMissingBean
+	public DiskSpaceMetrics diskSpaceMetrics() {
+		return new DiskSpaceMetrics(new File("."));
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/JvmMetricsAutoConfigurationTests.java

@@ -16,10 +16,7 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
-import java.io.File;
-
 import io.micrometer.core.instrument.binder.jvm.ClassLoaderMetrics;
-import io.micrometer.core.instrument.binder.jvm.DiskSpaceMetrics;
 import io.micrometer.core.instrument.binder.jvm.JvmGcMetrics;
 import io.micrometer.core.instrument.binder.jvm.JvmMemoryMetrics;
 import io.micrometer.core.instrument.binder.jvm.JvmThreadMetrics;
@@ -40,7 +37,6 @@
  *
  * @author Andy Wilkinson
  * @author Stephane Nicoll
- * @author Chris Bono
  */
 class JvmMetricsAutoConfigurationTests {
 
@@ -76,16 +72,9 @@ void allowsCustomClassLoaderMetricsToBeUsed() {
 				assertMetricsBeans().andThen((context) -> assertThat(context).hasBean("customClassLoaderMetrics")));
 	}
 
-	@Test
-	void allowsCustomDiskSpaceMetricsToBeUsed() {
-		this.contextRunner.withUserConfiguration(CustomDiskSpaceMetricsConfiguration.class)
-				.run(assertMetricsBeans().andThen((context) -> assertThat(context).hasBean("customDiskSpaceMetrics")));
-	}
-
 	private ContextConsumer<AssertableApplicationContext> assertMetricsBeans() {
 		return (context) -> assertThat(context).hasSingleBean(JvmGcMetrics.class).hasSingleBean(JvmMemoryMetrics.class)
-				.hasSingleBean(JvmThreadMetrics.class).hasSingleBean(ClassLoaderMetrics.class)
-				.hasSingleBean(DiskSpaceMetrics.class);
+				.hasSingleBean(JvmThreadMetrics.class).hasSingleBean(ClassLoaderMetrics.class);
 	}
 
 	@Configuration(proxyBeanMethods = false)
@@ -128,14 +117,4 @@ ClassLoaderMetrics customClassLoaderMetrics() {
 
 	}
 
-	@Configuration(proxyBeanMethods = false)
-	static class CustomDiskSpaceMetricsConfiguration {
-
-		@Bean
-		DiskSpaceMetrics customDiskSpaceMetrics() {
-			return new DiskSpaceMetrics(new File(System.getProperty("user.dir")));
-		}
-
-	}
-
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/SystemMetricsAutoConfigurationTests.java

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
+import java.io.File;
+
+import io.micrometer.core.instrument.binder.jvm.DiskSpaceMetrics;
 import io.micrometer.core.instrument.binder.system.FileDescriptorMetrics;
 import io.micrometer.core.instrument.binder.system.ProcessorMetrics;
 import io.micrometer.core.instrument.binder.system.UptimeMetrics;
@@ -34,6 +37,7 @@
  *
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ * @author Chris Bono
  */
 class SystemMetricsAutoConfigurationTests {
 
@@ -75,6 +79,18 @@ void allowsCustomFileDescriptorMetricsToBeUsed() {
 						.hasBean("customFileDescriptorMetrics"));
 	}
 
+	@Test
+	void autoConfiguresDiskSpaceMetrics() {
+		this.contextRunner.run((context) -> assertThat(context).hasSingleBean(DiskSpaceMetrics.class));
+	}
+
+	@Test
+	void allowsCustomDiskSpaceMetricsToBeUsed() {
+		this.contextRunner.withUserConfiguration(CustomDiskSpaceMetricsConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(DiskSpaceMetrics.class)
+						.hasBean("customDiskSpaceMetrics"));
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class CustomUptimeMetricsConfiguration {
 
@@ -105,4 +121,14 @@ FileDescriptorMetrics customFileDescriptorMetrics() {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class CustomDiskSpaceMetricsConfiguration {
+
+		@Bean
+		DiskSpaceMetrics customDiskSpaceMetrics() {
+			return new DiskSpaceMetrics(new File(System.getProperty("user.dir")));
+		}
+
+	}
+
 }

spring-boot-project/spring-boot-docs/src/docs/asciidoc/actuator/metrics.adoc

@@ -624,28 +624,28 @@ In most situations, the out-of-the-box defaults will provide sensible metrics th
 [[actuator.metrics.supported.jvm]]
 ==== JVM Metrics
 Auto-configuration will enable JVM Metrics using core Micrometer classes.
-JVM metrics are published under the `jvm.` and `disk.` meter names.
+JVM metrics are published under the `jvm.` meter name.
 
 The following JVM metrics are provided:
 
 * Various memory and buffer pool details
 * Statistics related to garbage collection
 * Threads utilization
 * The Number of classes loaded/unloaded
-* Disk space available
 
 
 
 [[actuator.metrics.supported.system]]
 ==== System Metrics
 Auto-configuration will enable system metrics using core Micrometer classes.
-System metrics are published under the `system.` and `process.` meter names.
+System metrics are published under the `system.`, `process.`, and `disk.` meter names.
 
 The following system metrics are provided:
 
 * CPU metrics
 * File descriptor metrics
 * Uptime metrics (both the amount of time the application has been running as well as a fixed gauge of the absolute start time)
+* Disk space available